COOKIE_DOMAIN setting confusion

As cdn.mydomain.com is not part of your WordPress network, it wont be affected by your settings.

The COOKIE_DOMAIN constant should only be used if you want to serve cookies from a single domain for all your sites in the network. If you omit the constant or set it to an empty value, cookies will belong to the domain their requested from. Thats the configuration you want to use for multisite/network environments especially when it comes to different domains.

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